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I am a Senior Software Engineer with extensive full-stack experience delivering scalable web applications and modernizing legacy systems. I specialize in building maintainable, performance-focused software and thrive in cross-functional teams to drive business outcomes. My strengths include React, Angular, Java, Spring Boot, .NET, and C#, with a proven track record of delivering enterprise-grade solutions on time and with high quality. I enjoy tackling architecture and performance challenges, mentoring teammates, and continuously improving development processes. I adopt a pragmatic, collaborative approach to translate complex requirements into reliable, user-focused software that scales with business needs.…I am a Senior Software Engineer with extensive full-stack experience delivering scalable web applications and modernizing legacy systems. I specialize in building maintainable, performance-focused software and thrive in cross-functional teams to drive business outcomes. My strengths include React, Angular, Java, Spring Boot, .NET, and C#, with a proven track record of delivering enterprise-grade solutions on time and with high quality. I enjoy tackling architecture and performance challenges, mentoring teammates, and continuously improving development processes. I adopt a pragmatic, collaborative approach to translate complex requirements into reliable, user-focused software that scales with business needs.

Marko Zrinjanin

Full Stack Developer, Front-End Developer, Back-End Developer, +2

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I am a Senior Software Engineer with extensive full-stack experience delivering scalable web applications and modernizing legacy systems. I specialize in building maintainable, performance-focused software and thrive in cross-functional teams to drive business outcomes. My strengths include React, Angular, Java, Spring Boot, .NET, and C#, with a proven track record of delivering enterprise-grade solutions on time and with high quality. I enjoy tackling architecture and performance challenges, mentoring teammates, and continuously improving development processes. I adopt a pragmatic, collaborative approach to translate complex requirements into reliable, user-focused software that scales with business needs.…I am a Senior Software Engineer with extensive full-stack experience delivering scalable web applications and modernizing legacy systems. I specialize in building maintainable, performance-focused software and thrive in cross-functional teams to drive business outcomes. My strengths include React, Angular, Java, Spring Boot, .NET, and C#, with a proven track record of delivering enterprise-grade solutions on time and with high quality. I enjoy tackling architecture and performance challenges, mentoring teammates, and continuously improving development processes. I adopt a pragmatic, collaborative approach to translate complex requirements into reliable, user-focused software that scales with business needs.

Available to hire

I am a Senior Software Engineer with extensive full-stack experience delivering scalable web applications and modernizing legacy systems. I specialize in building maintainable, performance-focused software and thrive in cross-functional teams to drive business outcomes. My strengths include React, Angular, Java, Spring Boot, .NET, and C#, with a proven track record of delivering enterprise-grade solutions on time and with high quality.

I enjoy tackling architecture and performance challenges, mentoring teammates, and continuously improving development processes. I adopt a pragmatic, collaborative approach to translate complex requirements into reliable, user-focused software that scales with business needs.

Skills

Experience Level

Expert

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Language

English

Fluent

Serbian

Fluent

Work Experience

Mobile Development Lead at TR3I Creative Agency

February 1, 2025 - Present

Led cross-platform mobile development using Flutter and Dart to deliver scalable, high-performance, and maintainable solutions. Delivered 10+ AI-powered features using generative AI, LLMs, and machine learning, improving user experience and response quality. Increased engineering productivity by ~30% using Cursor and GitHub Copilot for selected tasks. Collaborated with cross-functional teams to translate business requirements into reliable, user-focused mobile applications. Guided architecture, implementation, debugging, testing, release readiness, and continuous improvement across the mobile development lifecycle.

Software Developer at Insicon

February 1, 2025 - Present

Contributed to an in-house insurance platform built with .NET and Angular 15, used by staff to create customized policies for clients. Improved application performance and responsiveness by ~20% through optimization of existing features and system behavior. Performed extensive code cleanup and refactoring to improve maintainability, readability, and long-term stability. Supported enhancement of core business workflows related to policy creation and insurance operations. Participated in ongoing development, debugging, and continuous improvement of the platform.

Software Engineer at Orion Innovation

February 1, 2021 - July 1, 2023

Developed enterprise microfrontend applications for the Global Tax Platform for Ernst & Young, contributing to 5 of 20 application modules within a large-scale SaaS ecosystem. Used Angular, RxJS, and NgRx to build responsive, maintainable, and state-driven frontend features for complex business workflows. Applied hexagonal architecture concepts to support modular design, clean code practices, and scalable frontend development. Worked within an Azure cloud environment to support delivery of a secure and scalable Software as a Service (SaaS) platform.

Lead Software Developer at HYCU, Inc.

November 1, 2019 - February 1, 2021

Led HYCU modernization project for Micro Focus, overseeing a team of 12 engineers and QA specialists across frontend, backend, and testing. Managed migration of a legacy AngularJS application to Angular 2+, improving code maintainability and modernizing the user interface architecture. Drove decomposition of a monolithic system into a microservices architecture, supporting scalability and long-term platform evolution. Coordinated work across 5 frontend developers, 4 backend developers, and 3 QA engineers, ensuring effective collaboration and delivery. Participated in architecture planning, technical leadership, delivery oversight, and continuous improvement of software quality and development processes.

Software Developer at Comtrade Group

January 1, 2017 - November 1, 2019

Contributed to migration of the Operations Bridge Manager (OBM) application from Flex to Angular 8, modernizing a legacy enterprise system. Developed and maintained frontend components using Angular 8, HTML5, SCSS, and RxJS for a scalable and maintainable architecture. Implemented automated testing using Jasmine, Karma, and Cypress to improve software quality and reduce regression risk. Supported CI/CD workflows with Jenkins. Collaborated on feature migration, debugging, testing, and ongoing application improvements.

Software Developer at Comtrade IT Solutions and Services d.o.o.

December 1, 2013 - January 1, 2017

Developed and maintained enterprise applications, portals, and internal business systems for clients in public sector, logistics, and utilities. Contributed to key projects including the National Library of Serbia portal, eTender, ACP (Automated Case Picking) for Vanderlande, and test tools for Itron smart metering systems. Supported portal integration, data migration, feature development, and legacy application enhancement across multiple projects. Performed bug fixing, maintenance, and improvements to increase system reliability, usability, and operational efficiency. Collaborated with clients and cross-functional teams on requirements gathering, implementation, troubleshooting, and future development planning.